Mastering Error Handling in Power Automate: Retry and Escalate

Quick Answer

A full mailbox is a transient, recipient-side problem rather than a flaw in the flow's logic, so the right fix has to give the notification more than one chance to land: configuring the email action's 'Run after' settings to retry on failure addresses the possibility that the mailbox clears up or the condition is momentary, and adding an escalation to a secondary manager as a fallback ensures the leave request still gets seen even if the retries are exhausted. This two-part response matches the nature of the error itself, since retrying handles transient failures and the escalation handles the case where the failure turns out not to be transient after all. That's also what separates it from the weaker options: simply terminating the flow on error abandons the notification entirely instead of solving anything, alerting an admin only creates awareness of the problem without getting the actual approval request to someone who can act on it, and trying to check mailbox size before sending isn't a practical or reliable capability within Power Automate. The broader habit to build is that when a flow fails because of an external, recipient-side condition rather than bad logic, look for the answer that combines retry-based resilience with a fallback path, rather than one that only stops the flow or merely reports the failure.